[Freeswitch-dev] Linking C++ .so Into Custom Freeswitch Module

Anthony Minessale anthony.minessale at gmail.com
Fri Sep 28 19:27:06 MSD 2012

to auto-load you also need modules.conf.xml modules.conf is only for

The module can't load because it's missing the symbol:


So you need to link in any external libs you might be using into your .so

On Fri, Sep 28, 2012 at 12:05 AM, Jon Lederman <jon2718 at gmail.com> wrote:

> Hi,
> I am writing a custom module called mod_aw for freeswitch that uses a
> dynamic library called aw.so containing a c++ class.  I edited the makefile
> for my module to:
> BASE=../../../..
> LOCAL_LIBADD+=./lib/aw.so
> include $(BASE)/build/modmake.rules
> I am able to build the module and also modified modules.conf to include
> the new module.
> When I start freeswitch, I don't see a message that the module was loaded.
> When I type: reload mod_aw I receive the following error:
> 2012-09-28 04:49:52.738493 [CRIT] switch_loadable_module.c:1310 Error
> Loading module /usr/local/freeswitch/mod/mod_aw.so
> **/usr/local/freeswitch/mod/mod_aw.so: undefined symbol:
> _ZN10CAWETalker9ConfigureEPKc**
> -ERR unloading module [No such module!]
> +OK Reloading XML
> -ERR loading module [module load file routine returned an error]
> I know the library works as I have tried it in another program outside of
> freeswitch.  I am not sure what I am doing wrong.  I am wondering whether I
> need to provide extern "C" linkage for the c++ library.  However, I only
> have the .h file and .so file for the library.  Or, do I need to add
> something to my Makefile.
> Any help on how to configure this would be greatly appreciated.
> Thank you in advance.
> -Jon
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Anthony Minessale II

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